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Weaving Calculations

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A guide to calculations relating to yarn and cloth and all processes of weaving.It includes reed count, reed width, Maximum EPI for a particular count, weave density, crimp percentage, cloth cover factor etc.

A guide to calculations relating to yarn and cloth and all processes of weaving.It includes reed count, reed width, Maximum EPI for a particular count, weave density, crimp percentage, cloth cover factor etc.

  1. Reed Count
    It is calculated in stock port system.No. of dents in 2 inches is called Reed Count.
    Reed Count = EPI/(1 + Weft crimp %age)
  2. Reed Width
    Reed Width = Cloth Width *(100+ weft crimp %age)/100
  3. Crimp Percentage
    Crimp %age = {(Warp length – Cloth length)/Cloth Length}* 100
    Crimp %age = {(Warp width – Cloth width)/Cloth width}* 100
  4. Cloth Cover Factor
    1. Cloth Cover Factor = Wp.C.F +Wt.C.F. – {(Wp.C.F. – Wt.C.F)/28}
  5. Maximum EPI for particular count
    1. other design = (Ends /Repeat * 1/Yarn Diametre)/ (No of intersections/repeat+ ends/repeat)
  6. Warp Density

    • = <350
    • Weave Density = 50+{(Warp Density – 100) * F.D – 100} /{(Weft Density – 100)* F.D – 100}
    • Effective Weave Density = W. D x K of loom width x K of Design
      = < 72
Wp / filling – K  Loom Width – K  Weave Design – K
Cotton = 1.00 140 cm – 0.99 Plain1/1 = 1.00
Polyester/Cotton = 1.03 180 cm – 1.00 Twill 1/2 = 0.87
Viscose Filament = 1.17 190 cm – 1.01 Matt, Gabardine 2/2 = 0.82
Polyester Filament = 1.22 220 cm – 1.02 Drill 1/3 = 0.77
250 cm – 1.08 Satin 1/4 = 0.69
330 cm – 1.15
360 cm – 1.20

To change the count and the number of thread/inch, keeping the same denseness of fabric

To change the count without altering the denseness of the fabric
EPI in Exp.cloth = (EPI in exp.Cloth2/EPI in given cloth) * count in given cloth

To change the EPI without altering the denseness of the fabric

Warp requirement to weave the cloth

  • Warp weight in grams /metre = {(Total Ends * 1.0936 * 453.59 * crimp %)/(840 * count)} * wastage %
  • Weft weight in grams /metre ={(R.S. in inches * 453.59 * PPI)/(840 * count)} * wastage % * crimp %
  • Cloth length in metres with given weft weight=( weft weight in kgs * weft count * 1848 * 0.9144)/(PPI * R.S in inches)

For silk and Polyester

  • Warp weight in grams /metre ={(Total Ends * count (Denier) )/9000} * wastage % * crimp %
  • Weft weight in grams /metre = {(R.S in inches * count(Denier)* PPI)/9000}* wastage % * crimp %

Allowance for count in bleached and Dyed fabric

1.Count becomes 4%
2. FinerDyed counts become max 6% Coarser

Fabric Production Calculation

  • Loom Speed = Motor RPM * (Motor Pully Diametre)/(Loom Pully Diametre)
  • Loom Effeciency Percentage = (Actual Production/Calculated Production )* 100
  • Moisture Regain Percentage = {(Yarn Weight – Dried Yarn Weight)/Dried Yarn weight} * 100
  • Moistue Content Percentage = {(Yarn Weight – Dried Yarn Weight)/Yarn weight} * 100
Type of Yarn Moisture Regain % Moisture Content %
Cotton 8.50 7.83
Jute 13.75 12.10
Silk 11.00 9.91
Rayon, Viscose 11.00 9.91
Wool 17.00 14.50
Nylon 4.20 3.78
    • Warp Weight in Kg = (Total Ends * Tape Length in meters)/(1693.6 * Warp Count)
    • Weft Weight in Kg = (R.S in centimetres * cloth length in metres * PPI )/(4301.14 * weft Count)
    • Cloth weight in GSM = {EPI/Warp Cout)+(PPI/Weft count)}* 25.6
    • oz (ounce ) per sq. yard = GSM(Grams per sq. meter)/34


  • Material Measurement
    To calculate the length of any rolled fabrics, this formula gives the nearest accuracy.
    L = {0.0655(D-d)(D+d)}/t
    Where L = Length of material (Feet)    t = Thickness of fabrics (inches)
    D = Outside diameter (inches)   d = Inside diameter (inches)
  • The weight of yarn in a cloth
    The weight of cloth manufactured on looms depends upon the weight of yarns in the warp and weft: ends/inch, picks/inch and the weight of size on the warp. Therefore,
    Cloth weight = Weight of warp + Weight of weft + Weight of size (All in-lbs.)
    Whereas Weight of warp in lbs. = (Total No. of Ends * Tape Length in Yards)/(840 * warp yarn count)


  1. Vimal says

    How to calculate the on loom reed… anyone please help

  2. Abhishek bhattacharya says

    How to convert jute cloth Potter and shots to ends/dm and picks/ dm

  3. Dinesh says

    How to calculate # of meters possible in 1 kg of hemp yarn?

  4. R says

    To find number of looms formula.

  5. Tesema says

    What is “R.S in inches” mean?

    1. Siyad A says

      Reed Space

  6. Rahul says

    Sectional Warping Dintsty formula plz

  7. Rahul says

    Sectional Warping Density formula

  8. Palash says

    I am from Bangladesh..

  9. SUDHAKAR says

    We are interested to jute looms to start jute sack bags manufacturer unit at tirupattur tamilnadu so i required the details

  10. Asif jan says

    how we calculate yarn weight from given quality. e-g: 31/1×31/1/7366-71″

  11. Umar hayat says

    Weft crimp percentage formula

  12. Vineet says

    What is the WEAVE FACTOR & How to calculate Weave Factor for diffeent weave type of fabrics ?

  13. Sisir Ahmed says

    How to count pick of dobby design fabric with a pick counter?

  14. Md Tufan says

    How do pick insertation calculation?

  15. Anil Kumar Yadav says

    Your questions are best but u solve the problem

  16. chandrani says

    how do i calculate weft requirment on two plies fabric

  17. MD Ripon Islam says

    How to find out Ribstop Reed count?

  18. Andrea says

    What oth Cover Factor = Wp.C.F +Wt.C.F. Wp. and Wt. stands for?

  19. Muhammad Naseer says

    I need polyester fabrics costing software

    1. Anil Kumar Yadav says

      U give me solution of EPI and PPI

  20. Artistic Designing Studio says

    EPI = Ends Per Inch
    PPI = Pick Per Inch

  21. Zubair Ahmed says

    What is Warp/Weft Count Margin? And how can we calculate with formula?

  22. Kaustubh Vadulekar says

    R.S. stands for Reed Space

  23. Kaustubh Vadulekar says

    How to calculate Utilization % in weaving loomshed?

  24. Rahul says

    ppi calculat ..
    Example .
    Pick : 66
    Insertions : 2

    Pick×2= 132
    (ppi = 132)

  25. Liz says

    What does R.S stands for?

  26. Maulik says

    In warp density what is K stand for ?

  27. bapuji says

    how to slecect drop wire weight & heald wire eye size.

  28. Sanjit Kumar singh says

    why suzuki warping machine cost are more than loom weaving .

  29. Mali sagar says

    Plz simpl formula send me
    Waight of warp in kg
    ie. Meter to kg formula

  30. Rohit Sawant says

    How to calculate Number of intersection/repeat of given weave

  31. Johannes says

    how to find out that the harnesses are 11 ends/cm or 10 ends/cm?

  32. Drucilla Malabanan says

    I have been browsing online greater than 3 hours today, but I never discovered any attention-grabbing article like yours. It’s pretty worth enough for me. In my opinion, if all site owners and bloggers made excellent content material as you did, the internet will be a lot more helpful than ever before.

  33. sunil says

    What should be the width of dip fabric meant for tyre manufacturing to be maintained so that after rubber coating EPI will not change

  34. Akthar Hussain says

    How to calculate fabric weight per meter using 40 warp,60 weft, reed 58,pick 56,width 48 inches
    Can you please suggest the formula and how to use it

  35. Kiruthika says

    How to calculate the leno/bobin yarn consumption for required metres?

  36. Nabeel Jamal says

    what is EPI & PPI

    1. Hafiz Muhammad Rizwan says

      EPI stand for End pick per Inch while PPI stand for Pick Per Inch

      1. Shshariar says

        Construction: 30×20+70D/…….×60=61″

    2. Shruthi C N says

      EPI – Ends per Inch
      PPI – pucks per Inch

    3. Rupali says

      How to calculate ppi as per yarn count (formula)

    4. Gaurav Dixit says

      Ends per inch and picks per inch

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